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Planetary freedom and constructal drivers of Earth's architectures.

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Τίτλος: Planetary freedom and constructal drivers of Earth's architectures.
Συγγραφείς: Goldstein BM; Independent Researcher, Philadelphia, PA, USA. Electronic address: BritMGoldstein@gmail.com.
Πηγή: Bio Systems [Biosystems] 2026 Oct; Vol. 268, pp. 105931. Date of Electronic Publication: 2026 Aug 20.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Elsevier Science Ireland Country of Publication: Ireland NLM ID: 0430773 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1872-8324 (Electronic) Linking ISSN: 03032647 NLM ISO Abbreviation: Biosystems Subsets: MEDLINE
Imprint Name(s): Publication: Limerick : Elsevier Science Ireland
Original Publication: Amsterdam, North-Holland Pub. Co.
Ιατρικοί όροι (MeSH): Earth, Planet* , Evolution, Planetary*
Περίληψη: Constructal Law states that finite-size flow systems evolve configurations that provide progressively easier access to the currents flowing through them. In the Freedom-Planet Signal Constraint Hypothesis (FP-SCH), this principle operates within variance landscapes established by planetary formation and dynamical history. These landscapes-environmental freedom in the Constructal sense, the external variability a flow system must have to morph toward better access-are summarized with a dimensionless, Earth-normalized planetary-freedom index, Fh. For modern Earth, Fh = 1.0 reflects the Moon-forming giant impact, sustained tidal forcing, mobile-lid tectonics, volcanic-outgassing variability, and orbital-axial climate cycles. Where such variance reaches the biosphere as recurrent ecologically significant excursions, characterized by excursion return time τe, long-term evolutionary success is governed by geometric-mean rather than arithmetic-mean fitness. The framework derives the crossover at which recurrent unfavorable states favor a class of variance-buffering flow-access architectures that preserve useable currents. On Earth, one major realization of this class was pursuit-escape architecture, a flow-access solution combining active mobile flow tracking, bilateral symmetry, cephalization, and compressed perception-action loops. FP-SCH hypothesizes that this realization favored concurrent predictive error minimization, coherent information sharing, and persistent goal maintenance (Triad concurrency) as a falsifiable downstream hypothesis. The framework yields ordinal predictions: low-Fh or strongly buffered worlds should favor slower, distributed, sessile, mutualistic, or dormant strategies, whereas higher-Fh or less-buffered worlds whose variance reaches the biosphere should favor active, mobile flow tracking. These predictions offer priors for biosignature interpretation. Earth is one observed Constructal realization under a relatively high-freedom planetary regime, not a universal template.
(Copyright © 2026. Published by Elsevier B.V.)
Competing Interests: Declaration of competing interests The author declares no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Contributed Indexing: Keywords: Biosignatures; Constructal law; Environmental variance; Excursion return time; Geometric-mean selection; Planetary freedom; Pursuit-escape architecture; Triad concurrency; Variance-buffering architectures
Entry Date(s): Date Created: 20260820 Date Completed: 20260906 Latest Revision: 20260906
Update Code: 20260907
DOI: 10.1016/j.biosystems.2026.105931
PMID: 42624350
Βάση Δεδομένων: MEDLINE
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  Data: Constructal Law states that finite-size flow systems evolve configurations that provide progressively easier access to the currents flowing through them. In the Freedom-Planet Signal Constraint Hypothesis (FP-SCH), this principle operates within variance landscapes established by planetary formation and dynamical history. These landscapes-environmental freedom in the Constructal sense, the external variability a flow system must have to morph toward better access-are summarized with a dimensionless, Earth-normalized planetary-freedom index, F<subscript>h</subscript>. For modern Earth, F<subscript>h</subscript> = 1.0 reflects the Moon-forming giant impact, sustained tidal forcing, mobile-lid tectonics, volcanic-outgassing variability, and orbital-axial climate cycles. Where such variance reaches the biosphere as recurrent ecologically significant excursions, characterized by excursion return time τ<subscript>e</subscript>, long-term evolutionary success is governed by geometric-mean rather than arithmetic-mean fitness. The framework derives the crossover at which recurrent unfavorable states favor a class of variance-buffering flow-access architectures that preserve useable currents. On Earth, one major realization of this class was pursuit-escape architecture, a flow-access solution combining active mobile flow tracking, bilateral symmetry, cephalization, and compressed perception-action loops. FP-SCH hypothesizes that this realization favored concurrent predictive error minimization, coherent information sharing, and persistent goal maintenance (Triad concurrency) as a falsifiable downstream hypothesis. The framework yields ordinal predictions: low-F<subscript>h</subscript> or strongly buffered worlds should favor slower, distributed, sessile, mutualistic, or dormant strategies, whereas higher-F<subscript>h</subscript> or less-buffered worlds whose variance reaches the biosphere should favor active, mobile flow tracking. These predictions offer priors for biosignature interpretation. Earth is one observed Constructal realization under a relatively high-freedom planetary regime, not a universal template.<br /> (Copyright © 2026. Published by Elsevier B.V.)
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  Data: Declaration of competing interests The author declares no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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